Stacking of your images is the easy part, with many quality, free apps available.
But post-processing is where astrophotographers make their hard-won data really count.
StarTools lets you push your signal harder, with unrivalled fidelity, and without deep-faking detail.
By pooling 4 pixels, the final resolution is also reduced by a factor of 4.
Two version of the 'Size Bias' parameter exist; the 'High SNR Size Bias' parameter and the 'Low SNR Size Bias' parameter.
Wipe discerns gradient from real detail by estimating undulation frequency.
You can convert everything you see to a format you find convenient. Give it a try!